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After sufficient time has passed for the light source and optical power meter to stabilize, you need to measure the loss of the test jumpers. connect test jumper 1 as shown in figure 33.31. When testing multimode optical ber, test jumper 1 must have a modal controller, and when testing single-mode optical ber a single 30mm loop is required. Record the optical power displayed on the optical power meter. Disconnect test jumper 1 from the optical power meter; then connect test jumper 2 as shown in figure 33.32 and record the optical power displayed on the optical power meter. The loss for test jumper 2 in that direction is the difference between the recorded values.Remove test jumper 2 and interchange the ends. Take the end that was mating with testjumper 1 and connect it to the power meter. Mate the other end with test jumper 1. Record the optical power displayed on the optical power meter. The loss for test jumper 2 in that direction is the difference between the recorded values. If either value exceeds a specied limit, test jumper 2 cannot be used for testing the cable plant.
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